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Figure 3. The Influence of Testing Conditions on the Output Performance of KF DC-TENG. (A) Current and (B) charge transfer of KF DC-TENG under different accelerations, (C) current and (D) charge transfer of KF DC-TENG under different velocities, (E) current and (F) charge transfer of KF DC-TENG under different displacement distances, (G) current and (H) charge transfer of KF DC-TENG under different weights, (I) current and (J) charge transfer of KF DC-TENG under different humidities, (K) current of KF DC-TENG after 14,000 friction cycles. TENG: Triboelectric nanogenerator; KF DC-TENG: knitted fabric-based direct current TENG.